Found it! DMD Piggyback Board or DMD Saver Board

[benNinja]

Just wanted to see if anyone had a spare of either of these before I import them from abroad.

If anyone has had any experience with them either please do tell!

Here are links to retailers:
https://virtuapin.net/index.php?main_page=product_info&products_id=132

http://www.german-pinball-modular.de/aux-dmd-pcb.html